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Select the WRONG pair from the following...

Select the WRONG pair from the following

A

47, XXY - characteristic palm crease

B

trisomy of 21 - retarded mental and physical development

C

phenylketonuria - mental retardation

D

45, XO - sterility

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question of identifying the wrong pair from the given options, we will analyze each option step by step. ### Step 1: Analyze Option A - **Option A** states that 47 chromosomes with the condition XXY is characteristic of a "palm." - However, the correct condition for 47 chromosomes and XXY is actually known as **Klinefelter syndrome**, which occurs in males. - Therefore, Option A is incorrect. ### Step 2: Analyze Option B - **Option B** mentions that a trisomy of 21 causes Down syndrome. - This statement is correct as Down syndrome is indeed caused by the presence of an extra chromosome 21 (trisomy 21). - Therefore, Option B is correct. ### Step 3: Analyze Option C - **Option C** states that phenylketonuria (PKU) causes mental retardation. - This is also a correct statement, as PKU is a genetic disorder that leads to intellectual disability if untreated. - Therefore, Option C is correct. ### Step 4: Analyze Option D - **Option D** indicates that a 45 chromosome condition with an XO configuration (Turner syndrome) results in infertility or sterility. - This statement is accurate, as individuals with Turner syndrome typically have one X chromosome and are often infertile. - Therefore, Option D is correct. ### Conclusion After analyzing all the options, we find that: - **Option A** is the wrong pair as it incorrectly associates the XXY condition with "palm" instead of Klinefelter syndrome. ### Final Answer The wrong pair is **Option A**: 47 chromosomes (XXY) is incorrectly labeled as characteristic of a "palm." ---
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